Hi everyone, I’m new to Grasshopper and struggling to solve the following problem.
I’ve different surfaces at different heights. For every height, I’ve multiple points and I have to select only the points inside the surfaces of that level. I started to use the component Surface Closest Point, but it seems working with just one surface at a time. How can I work with multiple surfaces?
I attached the Grasshopper files. Be careful cause I used the Clipper component plugin.
Select Points.gh (16.4 KB)
Hi,
You need to match the tree structures by dropping 2 levels for the points.
Then all points in a branch “correspond” to the surface so the filtering should work level by level.
Select Points.gh (17.4 KB)
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Thank you very much, you really saved my day!!!
Just a last thing I would like to ask. After the Cull Pattern component, I have all the correct points. But if I try to create a polyline the final result, for every list, is just one polyline and not 3 (image below). How can I recreate the 3 different polylines for every layer?
Select Points.gh (15.9 KB)
Since your polylines seem to fully enclosed on a surface, you could cheat by filtering those instead of the points.
Otherwise, I’m afraid you’ll need to stick with the level 3 data tree (x;y;z = level;side;offset) which means duplicating the surfaces as many times as necessary to graft them into a level-3 datatree. Please tell me you don’t need this 
Select Points.gh (20.2 KB)
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thanks a lot! I’m trying with your first solution that seems smarter.
But, just in case, how hard would the second option be? 
I confirm that your first idea perfectly works. So really thank you again!!!
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That should do it (cyan group)
See how the tree structure is maintained at three levels, so some branches end up with a null polyline. Essentially this only tells you which offsets were removed.
Select Points_level3.gh (25.0 KB)
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ok perfect I’ll save both this option and the previous one.
thanks a lot!!!
